Clinical isolates of Yersinia enterocolitica Biotype 1A represent two phylogenetic lineages with differing pathogenicity-related properties

Table 3 LPS types of 298 Y. enterocolitica BT 1A strains and 84 Y. enterocolitica strains of other biotypes

LPS-type	Subtype	Description^c	Comments^d	Known O-serotypes with similar LPS[56]	No. of strains (n=382)
A. Homopolymeric O-PS
	A1^a	Short		O:41(27)43, O:41,43	7
	A2^b	Medium		O:10	25
	A2	Medium	BT 2 strains	O:9	5
	A3^a	Long			3
	A3	Long	BT 3–4 strains	O:1, O:2, O:3	77
B. Heteropolymeric O-PS
	B1a ^a, B1b ^a	2/M/1	B1b strains carry homopolymer	O:13,18	8
	B1c ^a, B1d ^a	2+w/M/1–2	B1d strains carry homopolymer	O:25	9
	B2a ^a, B2b ^a	2/L/1	B2b strains carry homopolymer	O:7,8, O:13,7	22
	B2c ^a, B2d ^a	2+w/L/1–2	B2d strains carry homopolymer	O:50	55
	B3 ^a	5–6+w/M/3–6		O:14, O:34, O:4,32	4
	B4 ^a	>5/M/7–10		O:4, O:8, O:21, O:35,52	1
C. Single length O-PS
	C1 ^a,	SL 15-mer		O:6, O:6,30, O:6,31	109
	C2 ^a	SL 30-mer		O:5, O:5,27	45
D. Rough or semi-rough
	D ^a		May include rough laboratory mutants	O:15, O:28,50, O:35,36	12

^a Biotype 1A, Genetic group 1.
^b Biotype 1A, Genetic group 2.
^c Homopolymeric O-PS length estimated by migration in DOC-PAGE; heteropolymeric O-PS is described by X/Y/Z, where X = number of steps in O-PS ladder (+ w indicates a faint extra step); Y = size of step (M, medium; L, long); Z = average modality of steps; Single length O-PS migrates as one band with estimated number of sugar residues.
^d The biotype of the strains is 1A unless otherwise indicated. The presence of homopolymeric O-PS was visible as a smear above the short ladders and not always easy to distinguish in silver-stained DOC-PAGE gels.

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